Phylogenetic tree based on the core genome MLST scheme from PubMLST including 42 Finnish ST-41/44 CC strains (A) and 1,109 public European ST-41/44 CC MenB strains (B). MLST, multilocus sequence typing; ST, sequence type; CC, clonal complex; MenB, meningococcal serogroup B; UK, United Kingdom. Note: dots represent Finnish strains, colored by their ST, in panel A and ST-303 strains, colored by their country of origin, in panel B. A detailed description of the algorithms used for tree construction can be found in Materials and Methods.